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NE20E-S V800R010C10SPC500 Feature Description - Interface and Data Link 01

This is NE20E-S V800R010C10SPC500 Feature Description - Interface and Data Link
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of Port Extension

Overview of Port Extension


On an IP core network, to meet more and more service deployment requirements on the access and network sides, PE devices need to provide high-density Ethernet interfaces. To enable a device to provide high-density Ethernet interfaces without increasing investments, Huawei implements port extension.

Technical Overview

On the network shown in Figure 3-1, port extension enables a device with higher performance to be configured as a master and a large number of low-end devices that support Ethernet interfaces to be configured as APs. The APs' Ethernet interfaces are then mapped to the master's port extension interfaces, so that the master provides high-density Ethernet interfaces. Services only need to be configured on the master's port extension interfaces.
  • AP: an access node in a port extension system. An AP can be considered as a master's board and is automatically discovered and managed by a master. An AP receives configuration and forwarding entries delivered by a master and provides external communication interfaces.

  • Master: a control node in a port extension system. A master establishes a tunnel, delivers services, controls traffic, and manages connected APs.

Figure 3-1 Conceptual graph of port extension

Related Concepts

The following table describes basic concepts involved in port extension.



Internal communication interface

An interface for connecting a master and AP. Virtual access is enabled on this interface.

External communication interface

An interface through which an AP connects to an outside network. This interface has the corresponding port extension interface on a master.

Port extension interface

A virtual mapping interface that a master establishes for an AP's external communication interface. A port extension interface on a master corresponds to an external communication interface on an AP.

Figure 3-2 Port extension system


Port extension offers the following benefits:
  • Reduced network construction costs

    A master uses fewer slots to provide high-density Ethernet interfaces. Port extension ensures that the existing devices that support Ethernet interfaces are fully used (as APs) and prevents a large number of devices that support Ethernet interfaces from being purchased, significantly reducing network construction costs.

  • Reduced network O&M costs

    The control and management planes are centralized on a master, and services are configured and queried on a master or network management system (NMS). Therefore, customers do not need to configure or manage services on APs, which significantly reduces network O&M costs.

Updated: 2019-01-03

Document ID: EDOC1100055118

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